Bottle stopper



FIG. 1 is an elevational view of the front of a bottle stopper according to the present design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a front, top perspective view thereof. 

The ornamental design for a bottle stopper, as shown. 